Potato germplasm development for warm climates: genetic enhancement of tolerance to heat stress |
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| Authors: | Richard E Veilleux Margarita M Paz David Levy |
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| Institution: | (1) Department of Horticulture, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, U.S.A;(2) Department of Field and Garden Crops, The Volcani Center, Bet Dagan, Israel |
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| Abstract: | Complex potato hybrids were derived through unilateral sexual polyploidization between Solanum tuberosum cv. Atlantic and
11 diploid hybrids that produced 2n pollen through co-orientation of second division spindles. The hybrids represented the
following genomic compositions: TAPB, TAPC, and TAPM where T = S. tuberosum, A = S. andigena, P = S. phureja, B = S. berthaultii,
C = S. chacoense, and M = S. microdontum. The B, C, and M components of the hybrids had been selected from heat tolerant accessions.
The heat tolerance and agronomic performance of the hybrids were assessed under both controlled environments and field tests.
The hybrids exhibited good tuberization potential (tuber number, tuber weight and percent plants producing tubers) under heat
stress conditions in controlled environments. Under severe heat stress conditions in the field in Israel, many of the hybrids
tuberized when Atlantic failed to produce any tubers at all. Under more moderate heat stress in Virginia, the complex hybrids
exhibited total tuber yield not significantly different from Atlantic, although the tuber set per plant was greater. However,
the complex hybrids were more tolerant to heat necrosis and hollow heart than Atlantic. Total glycoalkaloids in field-grown
tubers did not exceed the acceptable limit for 13 of 26 selections examined.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | glycoalkaloids Solanum berthaultii S chacoense S microdontum S phureja unreduced gametes |
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